文章摘要
连奕新.氧化苯乙烯加氢体系中竞争反应的影响因素[J].精细化工,2021,38(1):
氧化苯乙烯加氢体系中竞争反应的影响因素
Influential Factor of Competitive Reaction in Hydrogenation System of Oxidized Styrene
投稿时间:2020-07-06  修订日期:2020-08-12
DOI:
中文关键词: 竞争反应  氧化苯乙烯  苯乙醛  2-苯乙醇
英文关键词: Competition reaction  styrene oxide  2-phenylethanol  phenylacetaldehyde
基金项目:
作者单位E-mail
连奕新 厦门大学化学化工学院,醇醚酯化工清洁生产国家工程实验室 lianyx@xmu.edu.cn 
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中文摘要:
      以氧化苯乙烯为原料,通过催化加氢制得2-苯乙醇。研究了在氧化苯乙烯催化加氢体系中,不同活性金属、活性金属负载量、载体及反应条件等对氧化苯乙烯在催化加氢体系中对其存在的竞争反应的影响,选择Pd/Al2O3、Ni/Al2O3、Pt/Al2O3、Pd/MgO-Al2O3和Pd/AC(活性碳)催化体系为研究对象,采用XRD、H2-TPD、BET、XPS和催化剂评价方法探究了催化剂与竞争反应的关联性。研究发现,在Pd基催化体系中,提高反应温度可以促进氧化苯乙烯加氢反应进行,但是过高温度更有利于异构化生成苯乙醛并进一步发生缩合反应。通过优化筛选出:以Pd0.5/MgO-Al2O3为催化加氢体系和反应温度为100℃~200℃℃时,氧化苯乙烯转化率大于95%,目标产物2-苯乙醇选择性大于85%,而苯乙醛及其缩合物选择性小于15%。
英文摘要:
      The effects of different active metals, loads, carriers and reaction conditions on the competitive reaction of styrene oxide in catalytic hydrogenation system were studied. The catalytic systems of Pd/Al2O3、Ni/Al2O3、Pt/Al2O3、Pd/MgO-Al2O3 and Pd/AC were selected as the research objects. XRD, H2-TPD,BET,XPS and catalytic evaluation were used to investigate the correlation between catalysts and competitive reactions. It was found that in Pd catalysis system, higher reaction temperature can promote hydrogenation of oxidized styrene, but higher temperature is more favorable for isomerization into phenylacetaldehyde and further condensation reaction. When Pd0.5/MgO-Al2O3 is used as catalytic hydrogenation system and the reaction temperature is 100℃℃~200℃℃ , the conversion rate of oxidized styrene is greater than 95%, the selectivity of target product 2-phenylethanol is greater than 85%, and the selectivity of phenylacetaldehyde and its condensate is less than 15%.
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